cmd: add exception command
The 'exception' command allows to test exception handling.
This implementation supports ARM, x86, RISC-V and the following exceptions:
* 'breakpoint' - prefetch abort exception (ARM 32bit only)
* 'unaligned' - data abort exception (ARM only)
* 'undefined' - undefined instruction exception
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/exception.h b/include/exception.h
new file mode 100644
index 0000000..fc02490
--- /dev/null
+++ b/include/exception.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * The 'exception' command can be used for testing exception handling.
+ *
+ * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk@gmx.de>
+ */
+
+static int do_exception(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ cmd_tbl_t *cp;
+
+ if (argc != 2)
+ return CMD_RET_USAGE;
+
+ /* drop sub-command parameter */
+ argc--;
+ argv++;
+
+ cp = find_cmd_tbl(argv[0], cmd_sub, ARRAY_SIZE(cmd_sub));
+
+ if (cp)
+ return cp->cmd(cmdtp, flag, argc, argv);
+
+ return CMD_RET_USAGE;
+}
+
+static int exception_complete(int argc, char * const argv[], char last_char,
+ int maxv, char *cmdv[])
+{
+ int len = 0;
+ int i = 0;
+ cmd_tbl_t *cmdtp;
+
+ switch (argc) {
+ case 1:
+ break;
+ case 2:
+ len = strlen(argv[1]);
+ break;
+ default:
+ return 0;
+ }
+ for (cmdtp = cmd_sub; cmdtp != cmd_sub + ARRAY_SIZE(cmd_sub); cmdtp++) {
+ if (i >= maxv - 1)
+ return i;
+ if (!strncmp(argv[1], cmdtp->name, len))
+ cmdv[i++] = cmdtp->name;
+ }
+ cmdv[i] = NULL;
+ return i;
+}
+
+U_BOOT_CMD_COMPLETE(
+ exception, 2, 0, do_exception,
+ "Forces an exception to occur",
+ exception_help_text, exception_complete
+);